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ubuntucveUbuntu.comUB:CVE-2017-3732
HistoryJan 26, 2017 - 12:00 a.m.

CVE-2017-3732

2017-01-2600:00:00
ubuntu.com
ubuntu.com
56
openssl
carry propagating bug
dh-based
ssl/tls
ciphersuites
feasible attacks
limited number of attackers

CVSS2

5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

0.005

Percentile

76.7%

There is a carry propagating bug in the x86_64 Montgomery squaring
procedure in OpenSSL 1.0.2 before 1.0.2k and 1.1.0 before 1.1.0d. No EC
algorithms are affected. Analysis suggests that attacks against RSA and DSA
as a result of this defect would be very difficult to perform and are not
believed likely. Attacks against DH are considered just feasible (although
very difficult) because most of the work necessary to deduce information
about a private key may be performed offline. The amount of resources
required for such an attack would be very significant and likely only
accessible to a limited number of attackers. An attacker would additionally
need online access to an unpatched system using the target private key in a
scenario with persistent DH parameters and a private key that is shared
between multiple clients. For example this can occur by default in OpenSSL
DHE based SSL/TLS ciphersuites. Note: This issue is very similar to
CVE-2015-3193 but must be treated as a separate problem.

Notes

Author Note
mdeslaur only affects 1.0.2 and 1.1.0
OSVersionArchitecturePackageVersionFilename
ubuntu16.04noarchopenssl< 1.0.2g-1ubuntu4.6UNKNOWN
ubuntu16.10noarchopenssl< 1.0.2g-1ubuntu9.1UNKNOWN

CVSS2

5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

0.005

Percentile

76.7%